Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X46: 3D Frustrated Magnets: Other Geometries
11:15 AM–2:03 PM,
Friday, March 6, 2020
Room: 708
Sponsoring
Units:
GMAG DMP
Chair: Jeremy Carlo, Villanova Univ
Abstract: X46.00009 : Terahertz spectroscopy on breathing pyrochlore LiGaCr4S8*
Presenter:
YUFEI Li
(Ohio State Univ - Columbus)
Authors:
YUFEI Li
(Ohio State Univ - Columbus)
Evan Jasper
(Ohio State Univ - Columbus)
Ganesh Pokharel
(Physics, University of Tennessee)
Andrew D Christianson
(Materials Science & Technology Division, Oak Ridge National Laboratory)
David Mandrus
(Physics, University of Tennessee)
Rolando Valdes Aguilar
(Ohio State Univ - Columbus)
The breathing pyrochlore material LiGaCr4S8 has been measured to have a negative thermal expansion from 10 K to 110 K [1]. We performed THz transmission spectroscopy measurements in this temperature range on a polycrystal sample. An absorption at around 0.3 THz was found, which is possibly an excitation of the Cr3+ ion. We also observed a strong absorption above 0.6 THz likely due to lattice vibrations.
[1] Physical Review B 97, 134117 (2018), G. Pokharel, A. F. May, D. S. Parker, S. Calder, G. Ehlers, A. Huq, S. A. J. Kimber, H. Suriya Arachchige, L. Poudel, M. A. McGuire, D. Mandrus, and A. D. Christianson
*This research is supported by the Center for Emergent Materials, an NSF MRSEC under award number DMR-1420451. GP, DM, ADC are supported by the Gordon and Betty Moore Foundation’s EPIQS Initiative and U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.
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